Experimental or developmental tubes, including types with very
limited production |
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1DP1_Series |
Miniature CRT, orange screen.
National Union custom made variant. |
Custom |
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2J21 |
Very early X-band magnetron,
late 1941. Used in the early production of APS-3 airborne set. Superseded by
the 2J21A and then by 725A. |
Rare |
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2J21A |
Improved version of 2J21. |
Rare |
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3C27 |
Millimicropup UHF power triode.
National Union developmental. Superseded by 3C27B |
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3C27B |
Millimicropup UHF power triode.
As 3C27 plus finned grid radiator. National Union developmental. Superseded
by 3C37. |
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3C36
NU R1003 |
UHF power planar triode
registered in 1946 to National Union. Extremely rare, this is the only known
sample. |
Very rare |
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10AL1 |
British developmental S-band
klystron likely build at the Bristol Signal School. Believed to be a
transition type from the American WE 707A to the new low-profile family
including CV237 and CV238. Probably EMI, 1941. |
Unique |
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175HQ |
Bell pentode amplifier for
submarine telephone repeaters. Designed for utmost reliability, with more
than 50 centuries reported data MTBF. Bell internal use only. |
Extremely rare |
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227 EIMAC |
VHF power triode used in early
naval sets. Superseded by 227A. No data found. |
Rare |
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455A |
Western Electric ultra hi-rel
amplifier for transatlantic telephone repeater. Succesor of 175HQ, was used
in the 128 channels transatlantic SD system. |
Extremely rare |
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2154
Mullard |
Large window photocell |
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2242B |
Amperex photomultiplier |
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6090 |
National Union beam-switch
demultiplexer. Decodes 18 sequentially transmitted channels. |
Rare |
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6324 |
Beam-switch selector. Intended
to sequentially transmit 25 channels over a single carrier. |
Rare |
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A63-10 |
Diode, power. Unknown, likely a
damper diode |
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A-103A RCA |
Undocumented sample of
split-anode early magnetron, It can be dated around the early 1930s. |
Extremely rare |
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A-1306B
RCA |
RCA, believed to be a
developmental beam-deflection switch, usually intended for fast pulse forming
circuits. Coming from a British Marconi warehouse |
Extremely rare |
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A-2212 RCA |
RCA developmental UHF power
triode, pulse operation. Probably a prototype of 4C33. Coming from a British
Marconi warehouse. |
Unique |
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C-100A |
Amperex-Collins electrostatic
deflection oscillator designed according a 1915 patent of Robert Goddard.
About 1936 |
Very rare |
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C-100D |
Amperex-Collins negative
resistance oscillator. In 1938 replaced the C-100A. Also made the 6.3 V
filament version, C-100D |
Extremely rare |
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C31007-G13 |
RCA developmental
photomultiplier. Probably custom spectral response. |
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Catkin Prototype |
GEC developmental 'Catkin' power
prototype. Special finned radiator. Looks a variant of the NT39 / CV1222
transmitting triode. |
Unique |
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CV8 |
Vacuum diode intended to operate
as TR switch. Never in operative use, replaced by DS103 / CV94 |
Rare |
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CV11
- 10E/501 |
Very early British reflex
klystron, NR89 'Sutton tube', about 1940. AS fas as we know, this looks to be
the only NR89 survived today. See also 'Sutton tube prototype'. Coming from a
British Marconi warehouse. The only surviving sample today on the web. |
Extremely rare |
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CV14 |
Silica
valve', high emission variant of NT57T transmitting triode. Only experimental
use around 1941. |
Very rare |
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CV87
- KRN2 |
Early British X-band klystron.
About 100 units made between September 1942 and January 1943. |
Very rare |
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CV114 |
Early X-band TR cell. Devised
early in 1942 at TRE and built at GEC. |
Very rare |
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CV150 / PK150 |
Experimental power pulse
klystron designed by EMI to replace
NT98 magnetron in airborne missions over Germany. 1942 |
Extremely rare |
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CV208 Double
Stem |
Very early production of GEC
X-band strapped magnetron. Soon replaced by the single stem variant,
compatible with BTH CV209. |
Extremely rare |
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CV208 Single Stem |
GEC variant, compatible with BTH
CV209 |
Rare |
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CV209 |
BTH X-band strapped magnetron.
Internal code MX57, it was interchangeable with CV108 |
Rare |
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CV214 |
Waveguide-flanged X-band
magnetron |
Rare |
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CV230 |
Heil oscillator. Likely
developed by Fremlin at STC for a possible use as local oscillator in radar
receivers due to its low voltage operatio. Eventually the decision was taken
in favor of the NR89 klystron. Also known as DV55 or V230C/1D. |
Extremely rare |
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CV2368 |
Saturated diode, intended as
noise generator up to 500 MHz. Flying-lead base. MOV |
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CW10 |
Not really experimental, rather
extremely rare. Split-anode magnetron, likely designed by E. Megaw. Used in
very early experiments on microwave radio-localization. Mid 1930s. |
Extremely rare |
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DV27 |
Developmental S-band Heil
oscillator. Likely developed as local oscillator in radar receivers and
abandoned in favor of NR89 reflex klystron. Later used in secret experiments
to test the principle of FM barrage radar jammers. |
Unique |
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DV57 |
Similar to DV27 above, designed
to operate in the X-band. On the attached label is given as 3 cm equivalent
of DV55 or CV230 No data or information found. Coming from a British Marconi
warehouse |
Unique |
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E-1189 Prototype |
GEC internal developmental
prototype, likely used in the preliminary life and performance tests run
before manifacturing the sample No.12, the one brought to America by the
Tizard Mission. July 1940. |
Very unique |
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ET1 |
Electrometer amplifier. Not
experimental, rather very rare. Mid 1930s. |
Rare |
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GC-873 Amperex |
Undocumented
samples of electrostatically controlled thyratron. The control element is the
metal mesh around the glass bulb. Similar as per construction to the C-100A
oscillator that Amperex made for Collins in 1936. |
Rare |
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GRD7 |
Ferranti laboratory cylindrical
diode. As temperature-limited diode used to demonstrate the Richardson
emission law. Also used to demonstrate the Hull effect |
Rare |
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LMS
12 |
Extremely rare sample of a
German magnetron operating at 3 cm. Made just before the end of the war for
the microwave Berlin D radar set. |
Very unique |
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LMS
13 |
Extremely rare prototype of
German magnetron operating around 18 GHz. 5 kW pulse power. |
Very unique |
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LWG5 |
Developmental prototype of power
UHF triode, doorknob style. Presumably made by STC around 1940. Coming from a
British Marconi warehouse |
Unique |
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Magnetic Field CRT Sensor |
CRT operating as probe to
observe flux lines of magnetic fields. About 1937. |
Very rare |
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Magnetron
8 segments |
GEC developmental interdigital
magnetron. 8 segments electrode structure. Late thirties. |
Unique |
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Magnetron 12 segments |
GEC developmental interdigital
magnetron. 12 segments electrode structure. Late thirties. |
Unique |
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Omegatron |
Philips developmental Omegatron
sensor for mass spectrography. |
Unique |
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Q85033 |
Early 10 cm developmental
strapped magnetron. Likely built at Birmingham by the Sayers group. About
1941. |
Unique |
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QK174C |
C-Band CW magnetron,
frequency-modulated through electron beams oriented to the cavity gaps.
Raytheon |
Very rare |
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R1003 National Union |
NU internal code for 3C36 UHF
power triode |
Extremely rare |
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R-1790 RCA |
Orbital beam VHF amplifier.
Developmental prototype of 1630 giant acorn |
Extremely rare |
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REL Type 8 |
Canadian Rogers copy of the
British 'Sutton tube' reflex klystron. 1941 |
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RM 4025 |
Extremely rare prototype of
German Siemens & Halske internal resonator magnetron, operating around 3
cm. |
Very, very unique |
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RT-323
Toshiba |
VHF Japanese transmitting
triode, designed for Tachi No.7 mobile warning set. 1942 |
Extremely rare |
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SMC-11A |
Developmental klystron frequency
tripler. Sperry |
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Sperry Early Prototype |
Very early Sperry production
sample, still resembling the prototypes developed at Stanford by Varian
brothers. About 1939. |
Very rare |
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Sutton prototype |
Unbased bulb of 'Sutton tube'.
Presumably build in the developmental phase of the associated resonant
cavity. Mid 1940. |
Very rare |
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T-310A
JAPAN |
VHF/UHF Japanese transmitting
triode. Likely derived from German LS180 and intended for Tachi 24 radar.
Nothing found. |
Very unique |
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Thyratron, Developmental |
Looks to be a small
developmental hydrogen thyratron. Probably made by EEV. |
Unique |
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TY04-30 |
Early prototype of Mullard
doorknob UHF triode similar to WE 316A. Later replaced by TB04/8. About 1937
/ 1938. |
Very rare |
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UHF
Planar triode |
Looks to be
a quite crude prototype predating the 416A. |
Unique |
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VX6012 |
Trigatron spark gap,
experimental |
Unique |
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VX6122 |
British Mazda experimental power
diode, rectifier. 12 filamentary diodes in parallel |
Very rare |
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XL 7900 / 03 |
Vibrating capacitor, intended as
input stage in amplifiers for very feeble currents, as low as 500 electrons
per second. Very rare. |
Very rare |
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Last edited on Mar 10, 2018 |
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